WebPort 2001
Installation Guide
page 16
ver 2.02
5.7 Open collector Digital Output
The open collector output is located on the Input/Output connector, which stands beside of the Power Supply
connector.
This Digital Output is activated by an open collector transistor driven by an optocoupler. The maximum current flow
into this transistor has a characteristic above the value specified in the WebPort, in order to cope with the switching
power losses. The transistor used is in an open collector type with pre drive. This means the relay power supply has
to be supplied from an external source to the pre drive electronics.
The diagram below shows the external wiring needed for correct operation of the Digital Output. A relay has been
chosen for this sample application but any load within the specifications can be used instead.
Warning: note that this is a sink only output to ground (the transistor acts like a switch to ground).
Figure 13: Digital output: wiring diagram
Specification
Value
Type of output
Open collector
Max current (external source)
200mA @ 30 VDC
Isolation
3,5 kV
Pinout connector
See label and appendix (
Input/Outputs on page 27
)